FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -A data mart is a subset of a data warehouse focused on a particular line of business, department, or subject area. Data marts make specific data available to a defined group of users, which allows those users to quickly access critical insights without wasting time searching through an entire data warehouse.

Detailed explanation-2: -A data mart is a simple form of a data warehouse that is focused on a single subject (or functional area), hence they draw data from a limited number of sources such as sales, finance or marketing. Data marts are often built and controlled by a single department within an organization.

Detailed explanation-3: -Size:a data mart is typically less than 100 GB; a data warehouse is typically larger than 100 GB and often a terabyte or more.

Detailed explanation-4: -A data mart is a data storage system that contains information specific to an organization’s business unit. It contains a small and selected part of the data that the company stores in a larger storage system. Companies use a data mart to analyze department-specific information more efficiently.

Detailed explanation-5: -Thus, the primary purpose of a data mart is to isolate-or partition-a smaller set of data from a whole to provide easier data access for the end consumers. A data mart can be created from an existing data warehouse-the top-down approach-or from other sources, such as internal operational systems or external data.